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Hi @zainab786 the 'special' buildings you need are the ones you win after leveling up in Petopia.
See this below (from your picture) it is what is called a special building in Petopia 🙂
Hi @zainab786
What level number is it?
Hi @zainab786
Well done on getting to level 20.
I also find the levels seem to get harder and harder as I progress. Keep growing plants and getting petcoins - so useful for buying boosters to help you win more levels